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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e713ef6a2bde2cdcaf5d4e11c4a3f8b0e71b0ec6459745239acf70867aee36f' 
  AND token = 'SzopSZBK6UrBZqDJPXMcpm7jVS7dMFVjtCC8O5fUA7k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}